This is a 1.18mm diameter lead. The material is high polymer (highly refined particles). I believe it's the same material as Mitsubishi Pencil's Hi-Uni. It's very smooth. Many antique Montblanc and Pelikan pencils use 1.18mm leads, and I think many people are having trouble finding compatible leads. This will revive your antique pencil. ◆ Diameter: 1.18mm ◆ Length: 4.5cm ◆ Softness: 2B ◆ Quantity: 200 leads Enjoy the smooth writing feel. *To keep the price down, there is no dedicated case. The leads will be delivered in a cylindrical shape wrapped in plastic wrap, as shown in photos 2, 3, and 4. Thank you for your understanding.